Mercedes-Benz Body & Equipment Guideline for Metris - BM 447, Version November 27, 2015.
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9.6 Mobile communications systems
9 Electrical system
9.6
Mobile communications systems
If mobile communication systems (e.g. telephone,
CB radio) are retrofitted, the following requirements
must be fulfilled in order to avoid malfunctions develop-
ing on the vehicle at a later stage.
All electrical equipment installed in the vehicle must be
EMC-compliant.
9.6.1 Equipment
The maximum transmission output (PEAK) at the base
point of the antenna must not exceed the following
values. Moreover, country-specific laws regarding the
maximum permissible transmission output must be
observed.
Waveband
Maximum transmis-
sion output [W]
Short wave (f < 54 MHz)
100
4 m band
30
2 m band
50
Trunked radio/Tetra
35
70 cm band
35
GSM 900/AMPS
10
GSM 1800
10
UMTS/LTE
10
•
The mobile communication systems and brackets
must not be positioned in the deployment areas of
the airbags (
•
Equipment must be permanently installed. Portable
or mobile devices may only be operated inside the
cab if they are connected to an exterior antenna
which has been installed in such a manner that it is
reflection-free.
•
The transmitter unit must be installed as far away
from the vehicle's electronic system as possible.
•
The unit must be protected against moisture and
heavy physical shocks; the permissible operating
temperature must be observed.
9.6.2 Antenna connection and cable routing
(radio frequency)
•
Comply with manufacturer's notes and installation
instructions.
•
An antenna can be installed anywhere on the vehi-
cle roof. The maximum transmission output must
not be exceeded.
•
The connection should be made directly to termi-
nal 30 via an additional fuse. Disconnect the unit
from the electrical system before jump-starting.
•
The wiring routes must be kept as short as possi-
ble. The wires must be twisted and screened (coax-
ial cable). Chafing points must be avoided.
•
Ensure that the system has a good ground connec-
tion to the body (antenna and equipment).
•
The antenna and connecting wires between the
transmitter, receiver and operating panel must be
routed separately from the vehicle wiring harness in
the vicinity of the body ground.
•
Route the antenna cable in such a way that it is not
kinked or pinched.
•
FFC regulations must be observed.
The information in chapter 6.3 “Corrosion protection
measures” (
Page 58) and 6.4 “Painting work/
Page 60) must be observed.